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Plants which grow naturally in cold climates normally have an "inbuilt" dormancy factor, this means that they must be exposed to a cold period before they will germinate. Seeds of plants such as these have natural "antifreeze" which prevents the seed from being damaged at freezing or below zero temperature's.

Seeds of plants which originate in temperate climates do not have this and are killed by freezing temperatures. As the temperature approaches zero (C), water and fluids in the seed freeze, water expands and also forms ice crystals which rupture the cell walls - killing it.

Most commercial seed company's store seed in refrigerated conditions, at about 10 degrees (C) - this slows the metabolism of the cells in the seed, extending the life, but without causing damage to the seed.

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14y ago

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